/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
 *                                                                  *
 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002             *
 * by the XIPHOPHORUS Company http://www.xiph.org/                  *
 *                                                                  *
 ********************************************************************

 function: modified discrete cosine transform prototypes
 last mod: $Id: mdct.h,v 1.20 2002/01/22 11:59:00 xiphmont Exp $

 ********************************************************************/

#ifndef _OGG_mdct_H_
#define _OGG_mdct_H_

#include "../vorbis/codec.h"





/*#define MDCT_INTEGERIZED  <- be warned there could be some hurt left here*/
#ifdef MDCT_INTEGERIZED

	#define DATA_TYPE int
	#define REG_TYPE  register int
	#define TRIGBITS 14
	#define cPI3_8 6270
	#define cPI2_8 11585
	#define cPI1_8 15137

	#define FLOAT_CONV(x) ((int)((x)*(1<<TRIGBITS)+.5))
	#define MULT_NORM(x) ((x)>>TRIGBITS)
	#define HALVE(x) ((x)>>1)

#else

	#define DATA_TYPE float
	#define REG_TYPE  float
	#define cPI3_8 .38268343236508977175F
	#define cPI2_8 .70710678118654752441F
	#define cPI1_8 .92387953251128675613F

	#define FLOAT_CONV(x) (x)
	#define MULT_NORM(x) (x)
	#define HALVE(x) ((x)*.5f)

#endif


typedef struct
{
	int n;
	int log2n;

	DATA_TYPE* trig;
	int*       bitrev;

	DATA_TYPE scale;
} mdct_lookup;

extern void mdct_init( mdct_lookup* lookup, int n );
extern void mdct_clear( mdct_lookup* l );
extern void mdct_forward( mdct_lookup* init, DATA_TYPE* in, DATA_TYPE* out );
extern void mdct_backward( mdct_lookup* init, DATA_TYPE* in, DATA_TYPE* out );

#endif












